Mars Curiosity Rover - Mission Progress

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Profile Johnney Guinness
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Message 1288532 - Posted: 27 Sep 2012, 19:02:19 UTC
Last modified: 27 Sep 2012, 19:05:03 UTC

NASA Rover Finds Old Streambed On Martian Surface
http://mars.jpl.nasa.gov/msl/news/whatsnew/index.cfm?FuseAction=ShowNews&NewsID=1360

Qoute NASA:
"PASADENA, Calif. -- NASA's Curiosity rover mission has found evidence a stream once ran vigorously across the area on Mars where the rover is driving. There is earlier evidence for the presence of water on Mars, but this evidence -- images of rocks containing ancient streambed gravels -- is the first of its kind."



John.


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Message 1288587 - Posted: 27 Sep 2012, 22:15:52 UTC

"From the size of gravels it carried, we can interpret the water was moving about 3 feet per second, with a depth somewhere between ankle and hip deep," said Curiosity science co-investigator William Dietrich of the University of California, Berkeley.


Go Curiosity!

Go Berkeley!

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Message 1288827 - Posted: 28 Sep 2012, 14:53:09 UTC - in response to Message 1288587.

that stuff almost looks like asphalt


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Message 1288979 - Posted: 28 Sep 2012, 18:59:05 UTC

Gravel on Mars. So there really was water there, wow.


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Profile William Rothamel
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Message 1289078 - Posted: 28 Sep 2012, 22:42:49 UTC
Last modified: 28 Sep 2012, 22:43:33 UTC

I don't think anyone ever doubted that water once ran on Mars. Now. Was there microbial or plant life there once ??

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Message 1289877 - Posted: 30 Sep 2012, 23:24:28 UTC - in response to Message 1289078.
Last modified: 30 Sep 2012, 23:42:15 UTC

I don't think anyone ever doubted that water once ran on Mars. Now. Was there microbial or plant life there once ??

I don't see why not, Will'. Even if oxygen was absent in the atmosphere
then there must be every chance that some plant life's were able to extract
it from the water....that's even if they actually needed it?
Yet we might find evidence that Mars once had an atmosphere very similar to
that of Earth but simply lost it over time. I wonder if it's low gravitational
field has any thing to do with this loss.

For sure though, since we have another planet in our solar system that shows
signs of having had the potential for life on it even if only rudimentary plant
life then how many of these type planets then exist out in the universe?
I've been a believer in that only Earth has life on it but I'm now undergoing
a radical rethink on it all since the Mars data has started coming through.
Should breath new life into Seti although I feel that Earth posses the only
form of intelligent life. Yet only a fool would follow this philosophy blindly
hence rather than be a fool I assist in the search for intelligent life via Seti.
The Kite Fliers

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Kite fliers: An imaginary club of solo members, those who don't yet
belong to a formal team so "fly their own kites" - as the saying goes.

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Message 1290746 - Posted: 3 Oct 2012, 14:34:33 UTC - in response to Message 1289078.
Last modified: 3 Oct 2012, 14:36:19 UTC

I don't think anyone ever doubted that water once ran on Mars. Now. Was there microbial or plant life there once ??

The important bit is that the gravels show signs of long term erosion suggesting that there was flowing water for a long time.

All past suggestions for water on Mars have always been tempered by the assumption that the surface water could never last for long due to the atmosphere for Mars always being rapidly ripped away and depleted by the solar wind.

Perhaps liquid water could have been there long enough for life to start?...


Keep searchin',
Martin
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Message 1290796 - Posted: 3 Oct 2012, 15:59:18 UTC - in response to Message 1290746.
Last modified: 3 Oct 2012, 16:00:49 UTC

I don't think anyone ever doubted that water once ran on Mars. Now. Was there microbial or plant life there once ??

The important bit is that the gravels show signs of long term erosion suggesting that there was flowing water for a long time.

All past suggestions for water on Mars have always been tempered by the assumption that the surface water could never last for long due to the atmosphere for Mars always being rapidly ripped away and depleted by the solar wind.

Perhaps liquid water could have been there long enough for life to start?...


Keep searchin',
Martin

Good point Martin!

People should be very careful in assuming that liquid water can exist on the surface of Mars. Because liquid water CAN'T exist on the surface of Mars without some kind of container to hold it together.

Fact No.1 - If there is no gravitational pull to hold water molecules together, or a container of some sort, they will evaporate away into empty space. So if you were on the international space station, and you emptied a bucket of liquid water out the window, it would evaporate away into space. It would NOT stay liquid!

Fact No.2 - If you were standing on the surface of Mars today in your space suit, and you opened a bottle of liquid water, the water would evaporate away because there isn't enough gravity on the surface of Mars to keep the water liquid.

And to be honest, its even questionable if there was ever conditions on Mars, at any stage in the planets history, for liquid water to exist!

Maybe its possible that some other type of liquid (not water) could have flowed on the surface of Mars at some stage.

I personally don't believe that "liquid water" could ever have existed on the surface of Mars. I don't care what NASA says.

John.

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Message 1291229 - Posted: 4 Oct 2012, 16:03:06 UTC

I personally don't believe that "liquid water" could ever have existed on the surface of Mars. I don't care what NASA says.

Johnney .......

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Message 1291234 - Posted: 4 Oct 2012, 16:11:36 UTC

Aside from the Pheonix lander having actually found water, whats not to believe. Remember faith takes belief. Science takes evidence. The probes have already found evidence.


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Message 1291317 - Posted: 4 Oct 2012, 17:54:53 UTC

It hasn't "found" water, it seems to have found evidence that water did "once" exist.

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Message 1291348 - Posted: 4 Oct 2012, 19:21:22 UTC - in response to Message 1291317.

I was speaking of the Phoenix lander. It showed photos of uncovered frost and its evaporation. That pretty strong evidence


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Message 1291364 - Posted: 4 Oct 2012, 20:16:35 UTC - in response to Message 1291229.
Last modified: 4 Oct 2012, 20:20:46 UTC

I personally don't believe that "liquid water" could ever have existed on the surface of Mars. I don't care what NASA says.

Johnney .......


Chris,
I take it your looking for me to back up my statement with some quality science.

Ok;
The gravitational pull on the surface of Mars is 0.376 g[http://en.wikipedia.org/wiki/Mars], or roughly one third the pull of gravity on the surface of earth. In Earths gravity, water can exist as a liquid on the surface because of the surface temperature, roughly 20 degrees C, which is a direct result of the Earth's gravitational pull. But on Mars, the planet was never any bigger in its past, so its highly unlikely that its surface gravity was every any different. And Mars is too far from the Sun to heat up the water. Hence liquid water could never have existed on its surface. The surface temperature and "pressure" was never high enough to allow water to exist as a liquid.

John.

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Message 1291395 - Posted: 4 Oct 2012, 21:35:10 UTC

It's entirely possible that Mars' atmosphere was at one time substantially thicker than at present. It is believed that the solar wind gradually eroded this atmosphere; Mars' relatively low gravity being unable to to retain it against such an onslaught. A thicker atmosphere could have allowed liquid water to be much more stable on the surface. It could also have allowed higher temperatures, which would permit liquid water, instead of just ice. The signs of land erosion by what appear to have been rivers points strongly to such an environment. What other liquid is proposed that could have eroded channels, deltas, and the like, and left mineral deposits characteristic of those left behind by water?

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Message 1291400 - Posted: 4 Oct 2012, 21:57:46 UTC - in response to Message 1291395.
Last modified: 4 Oct 2012, 22:00:40 UTC

It's entirely possible that Mars' atmosphere was at one time substantially thicker than at present. It is believed that the solar wind gradually eroded this atmosphere; Mars' relatively low gravity being unable to to retain it against such an onslaught. A thicker atmosphere could have allowed liquid water to be much more stable on the surface. It could also have allowed higher temperatures, which would permit liquid water, instead of just ice. The signs of land erosion by what appear to have been rivers points strongly to such an environment. What other liquid is proposed that could have eroded channels, deltas, and the like, and left mineral deposits characteristic of those left behind by water?

Michael,
Its the Earth's gravity is the reason we have roughly 100km of atmosphere(Air) over our heads. Remember the Moon is one sixth the Mass of Earth and can't hold any atmosphere at all. Mars is a much smaller planet, and has only one third our gravity. This is why Mars has only a very very thin atmosphere. Its because it doesn't have enough gravitational pull to pull the air molecules down to the surface. And unless Aliens had a massive gravity generator in the middle of Mars in its past, then it never had a stronger gravity, and hence it never had enough "pull" to hold a thicker atmosphere.

So if "liquid" flowed on Mars at some stage, it wasn't water. But its possible that some other substance did flow. Keep in mind that with the thin atmosphere on Mars, it gets hugh winds. This could move hugh amounts of sand across the surface that will erode channels and it might look like a liquid flowed there in the past. There is frozen water on the poles of Mars.

John.

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Message 1291510 - Posted: 5 Oct 2012, 4:40:59 UTC
Last modified: 5 Oct 2012, 4:41:27 UTC

NASA JPL News - Curiosity takes a scoop of Mars dirt!

Curiosity Report (Oct. 4, 2012): Rover Gets Set to Scoop
http://www.youtube.com/watch?v=I5b6KSTst-o (2 minute news video)

John.

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Message 1294054 - Posted: 12 Oct 2012, 5:17:10 UTC - in response to Message 1291510.

Using a laser and X-rays, the NASA rover Curiosity identified a rock named Jake as a form of basalt, similar to volcanic rocks found in ocean-island settings on Earth.


The rock named Jake Matijevic that Curiosity explored for several days on Mars. Red dots indicate areas where the rover shot the rock with laser blasts while purple circles indicate areas investigated with X-rays beams. NASA/JPL-Caltech/MSSS


Curiosity Rover Finds Rock Type That’s Never Been Seen on Mars


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Message 1294113 - Posted: 12 Oct 2012, 9:28:21 UTC
Last modified: 12 Oct 2012, 9:29:15 UTC

Lynn,
Ok, thats clear evidence that Martians were drawing purple lines and red dots on the rocks on Mars. The evidence is undeniable!!!

Yipeeeee....We got em!! This is the big one!! We have evidence of Martians doing children's drawings on the rocks!! We have proof of aliens on Mars!!

John :)

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Message 1294134 - Posted: 12 Oct 2012, 10:56:57 UTC

You are a riot Johnney, it has to be said :-)

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Message 1294490 - Posted: 13 Oct 2012, 0:20:10 UTC - in response to Message 1294113.

Lynn,
Ok, thats clear evidence that Martians were drawing purple lines and red dots on the rocks on Mars. The evidence is undeniable!!!

Yipeeeee....We got em!! This is the big one!! We have evidence of Martians doing children's drawings on the rocks!! We have proof of aliens on Mars!!

John :)



Alrighty then , agreed :-)

But, scientists expected to find a rock similar to the ones seen on previous missions to Mars. But instead, they found a rock with a composition seen in many rocks on Earth.

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Message boards : Science (non-SETI) : Mars Curiosity Rover - Mission Progress


 
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